"A measure of the degree to which a system or component performs designated functions with respect to the resources it consumes to perform those functions." (Richard D Stutzke, "Estimating Software-Intensive Systems: Projects, Products, and Processes", 2005)
"a measure of the cost per time or cost per effort." (Bruce P Douglass, "Real-Time Agility: The Harmony/ESW Method for Real-Time and Embedded Systems Development", 2009)
"A quasimetric used throughout this book to describe how well memory and other resources of the processor and platform are utilized by a concurrent implementation." (Clay Breshears, "The Art of Concurrency", 2009)
"Efficiency measures the return on investment in using additional hardware to operate in parallel." (Michael McCool et al, "Structured Parallel Programming", 2012)
"A set of software characteristics (for example, execution speed, response time) relating to performance of the software and use of resources (for example, memory) under stated conditions (normally increasing load)." (Tilo Linz et al, "Software Testing Foundations" 4th Ed., 2014)
"In relation to performance/operational auditing, the use of financial, human, physical, and information resources such that output is maximized for any given set of resource inputs, or input is minimized for any given quantity and quality of output." (Sally-Anne Pitt, "Internal Audit Quality", 2014)
"Efficiency is the degree to which a resource is utilized for the intended task." (Hari K Kondaveeti et al, "Deep Learning Applications in Agriculture: The Role of Deep Learning in Smart Agriculture", 2021)
"a measure of whether the right amount of resources has been used à to deliver a process, service or activity" (ITIL)
"Resources expended in relation to the accuracy and completeness with which users achieve goals." (NISTIR 8040)
"The capability of the software product to provide appropriate performance, relative to the amount of resources used under stated conditions." (ISO 9126)
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